<!DOCTYPE html>
<html lang="en">

<head>
    <meta charset="UTF-8">
    <meta name="viewport" content="width=device-width, initial-scale=1.0">
    <title>移动端拖动元素</title>
    <style>
        div {
            position: absolute;
            width: 100px;
            height: 100px;
            background-color: pink;
        }
    </style>
</head>

<body>
    <div></div>
    <script>
        var div = document.querySelector('div')
        var startX = 0
        var startY = 0
        var x = 0
        var y = 0
        div.addEventListener('touchstart', function(e) {
            startX = e.targetTouches[0].pageX
            startY = e.targetTouches[0].pageY
            x = this.offsetLeft
            y = this.offsetTop
        })

        div.addEventListener('touchmove', function(e) {
            var moveX = e.targetTouches[0].pageX - startX
            var moveY = e.targetTouches[0].pageY - startY
            this.style.left = x + moveX + 'px'
            this.style.top = y + moveY + 'px'
            e.preventDefault()
        })
    </script>
</body>

</html>